The case of the murder of Anna Lavrentyeva, which was investigated by Colonel Gushchin, together with Klavdy Mamontov and Makar Psaltyrnikov, only at first glance had domestic motives. As soon as a new atrocious crime took place, it turned overnight into a complex puzzle with many unknowns. And then there was a secret friend suddenly wound up among the little daughters of Makar - teenager Adam. His own mother Eve is terrified and hates him, considering him a creature of Darkness. Step by step, Colonel Gushchin and his partners will have to unravel a whole tangle of versions, frightening facts and gloomy superstitions in order to establish the truth and find the relationship between the chain of murders and the events of fifteen years ago, when Adam was born, and at an abandoned hydroelectric power station, security forces stormed a sinister sect that practiced orgies and dark rituals…